Many of the maps and charts that had been stored in a large rack in the corner of the library had been left behind, and Arthur selected a large-scale representation of the Peninsula and unrolled it across the table, helping Somerset pin the corners down with some of the discarded books. Then he stared at the map thoughtfully. Less than two years ago his army had been crammed into a small sliver of land north of Lisbon, while the French had free range across the rest of the sprawl of land depicted on the map. Now, the French were pressed back into the north and east of Spain. While they still had over two hundred thousand men in their armies, the marshals were bitterly divided and treated Joseph with barely disguised contempt, according to the reports of Arthur’s agents. Moreover, they had been largely abandoned by their master as he pursued his apparently limitless ambitions in Russia.

Arthur was still astonished by the news of the invasion, and the scale of the forces involved. Just half of the resources Bonaparte had deployed in Russia would have enabled him to settle his troubles in Spain very swiftly indeed. As it was, the soldiers of the Emperor were now forced to fight on two fronts, stretched thinly over hostile terrain with only the most rudimentary of road systems. Unless destiny was perversely overgenerous in the favour it bestowed on Bonaparte, his empire was being stretched to its limits. Here in Spain, Arthur was determined to strike a mortal blow to French aspirations. If the Tsar could do the same in the depths of Russia, then surely this war of wars was drawing towards the final act.

Arthur focused his mind again. At length he put voice to his thoughts as Somerset and Alava stood either side of him. ‘With Joseph having fallen back on Suchet’s army at Valencia we are faced with the prospect that Soult will at some point come to his senses and join forces with them, in which case we will, as so often before, be outnumbered. However, I believe that we might still be able to hold the centre of Spain if we can be sure that we have contained what is left of Marmont’s strength as far north as the river Ebro. That means taking Burgos.’ He turned to General Alava.‘What do you know of the fortress of Burgos?’

‘It is on the main route between France and Madrid. Bonaparte must have recognised its importance, since he ordered a number of improvements to the defences.’ Alava shrugged.‘Though nothing on the scale of Badajoz.’

‘I’m glad to hear that. Might I ask if you have actually seen the fortress since these improvements were made?’

‘No,’Alava replied frankly.‘But I have heard enough from my sources to know that Burgos will not present you with much difficulty, my lord.’